Cod sursa(job #1341870)

Utilizator LurchssLaurentiu Duma Lurchss Data 13 februarie 2015 10:40:21
Problema Algoritmul Bellman-Ford Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 1.41 kb
#include <iostream>
#include <fstream>
#include <queue>
#include <vector>
#include <algorithm>
#include <string.h>

#define inf 0x3f3f3f3f
#define max 50001
using namespace std;
int n,m;
int nmax[max];
int d[max];
vector<pair<int,int> > g[max];
queue<int> q;
bool viz[max];
void citire()
{
    scanf("%d %d",&n,&m);
    int x,y,c;
    for(int i=1;i<=m;i++)
    {
        scanf("%d %d %d",&x,&y,&c);
        g[x].push_back(make_pair(y,c));
    }
}

void bellman()
{
    q.push(1);
    memset(d, inf, sizeof(d));
    d[1]=0;
    while(!q.empty())
    {
        int top=q.front();
        q.pop();
        viz[top]=false;
        for(int i=0;i<g[top].size();i++)
            if(d[g[top][i].first]>d[top]+g[top][i].second)
                  {
                      if(++nmax[top]>=n)
                         { printf("Ciclu negativ!");
                            exit(0);
                         }
                      if(!viz[g[top][i].first])
                        q.push(g[top][i].first);
                      viz[g[top][i].first]=true;
                      d[g[top][i].first]=d[top]+g[top][i].second;
                  }
    }
}
void afisare()
{
   int i;
   for (i=2; i<=n; i++)
      printf("%d ", d[i]);
}
int main()
{
    freopen("bellmanford.in", "r", stdin);
    //freopen("bellmanford.out", "w", stdout);
    citire();
    bellman();
    afisare();
    return 0;
}